Plunger pump



April 1933- c. l. LONGENECKER 1,904,486

' PLUNGER PUMP Filed June 19, 1930 2 Sheets-Sheet l iNVENTOR Chas. lILongenec-ker,

ATTORNEYS April 1933.

Filed June 19, '1950 c. I. LONGENECKER PLUNGER PUMP 2 Sheets-Shea t, 2

ATTORNE Patented Apr. 18, 1933 UNITED STATES PATENT orFiCE 2 CHARLES I. LONGENECKER, F wAUw 'ros WISCONSIN, .AssLeNoR To CHAIN BE T 1* COMPANY, or MILWAUKEE, WISCONSIN, A CORPORATION or WISGOLISILI PLUNGER PUMP Application filed June .19,

This invention relates to plunger pumps, and more particularly to pumps of this type which are intended for use by building, pavv ing and other contractors, in the field, for pumping dirty water, mud and slimes, and has for one of its objects the provision of improved lubrication and packing for the working surfaces of the cylinders and plungers of such pumps.

The lubrication of pumps of this character has proven to bequite a .problem,'due to the nature of the materials beingpumped, and to the fact that the pumpsreceive little or no attention on the part of the operator. The water which they are .called .upon to force nearly always contains some sand or other gritty, abrasive substance, and-theyare in many cases employed in :the pumping of extremelymuddy water containing high per centages-of solids. Under suchv conditions, the working-surfaces of the :cylinders and .plungers :are of :necessity 1 subject to relativelygreat wear, and it is of extreme importance to provide as efficient lubrication and 25 packing i'or these surfaces asis possible.

To this end, the present invention comprises the use of a -substantially closed :hollow plunger, which maycontain oil orother suitable lubricant, which will be automaticallyfed to the cylinder walls without 'attention on the part of .thewoperator other than to replenish the supply of lubricant within the plunger when it becomes exhausted. The said hollow plunger is inverted, or disposed with its headdownwardly, and'comprisestwo telescoping members adjustably secured together, with yieldable packingbetween them for engaging the cylinder walls to' preventthe water. from working up past'the plunger, and the lubricant from working down into thepump chamber. The top wall of the-upper'of'the two telescoping plunger members'is provided with acentralopening to accommodate the connecting rod which moves the plunger, andfin order to conserve any lubricant which ;may splash'out through this opening, as it sometimes does in a'ctualoperatiomthesaid'top 'wall is inclined downwardlyin. all'directions iromfthe said opening, so thatsuch splashed 1930. Serial ,No. 462.2811

lubricant will run to the outer periphery of the plunger. The upper portion of the .cylinder is enlarged or flared outwardly topro vide a space which may receive this oil as the plunger works up and down, and supply it to the working walls of the cylinder as needed. i V 1 Referring to the accompanying drawings, in which one form .ofzthe invention is illustrated, .and in which like reference charactcrs designate like parts in all :the views :7 Figure 1 is a diagrammatic plan view ofa portable plunger pump ofthe type abovedescribed,and intended for road work or other similar use;

Fig. 2 is-a diagrammatic side .elevational view ofthe parts shown in-Fig. l;

Fig. 3 is an enlarged vertical sectional view through the pump acylinder, .plunger and working chamber; and I Fig. 4.- isxa cross sectional view, taken ap proximately on the plane indicated by :the line 4+4,'of Fig. 3. ,In the said drawings, 10 indicates :a irame or chassis, mounted upon themed-wheels 11, 15.

and carrying the working chamber gor w'ater box 12, which receives thelo-werend Ofethe vertical pump; cylinder 1.3..- ;:An internal combustion engine or other so rce o'f power is enclosed within a housin'g 14:,jandis con,- nected by suitable :gearing Within-the ge'ar :casing :15 to the crank. shaft 16, carrying-the crank 17., which is connected ..throughthe;pitman 118 with .the rocker.;19. The connecting rod 20;is.pivoted=:at.one'end-tothe saidmocker arm 19,-and atits other end'tozthe plunger.21. An inlet'valve housing, 22, containing the inlet valve '23,.is secured-.to one end of the water box or working chamber 12,:and :the: supply conduit2t leads to the said valve housing 22, as will be clear :from Fig. 13. The outlet valve housing25, "oontainingithe outlet "valve 26, is secured tot-he opposite end portion ofthe waterbox, and discharges into the outlet -;.conduit 27. The .usual ,air :cushion tank or chamber 28 jis. preferably provided, .being- 1 connected :to ,the discharge line by: the 1 pipe-29' leading-from :the outlet valve housing 25,.=substantially as shown.

The plunger- 21, which constitutesanim- T l-00 portantfeature of the invention, comprises a piston member 30, having a working head 31, and a hollow skirt portion 32 of somewhat lesser diameter than the said head. The said skirt portion is provided with the alined bearings 33, having the bores 34, which receive the piston pin 35,by means of which the connecting rod is pivoted to the plunger. The said pin 35 is preferably held against rotation by a set screw 36, and transverse lubricant passages 37 lead into the said bores 34.

An inverted hollow follower 40 telescopes over the skirt portion 32of the. piston mem ber 30, and is detachably and adjustably secured .by bolts or other suitablev fastenings 41, as will be clear from the drawings. The inner periphery of the saidfollower is provided with a circumferential lubricant groove or passage 42, which in the assembled positions ofthe parts comes opposite to the ends of the piston pin bores 34, and radial lubricant passages 43 lead from the said circumferential groove 42 to the outer periphery of the. follower. An asbestos rope or other similar compressible packing 44 is interposed between the lower end of the 'follower and the working head 31 of the piston member, and since the follower is adjustable relative to the piston member, as above explained, wear upon the said packing may be taken up by screwing down on the bolts 41, as will be readily understood.

, The top wall 45 of the follower is provided with a central opening 46 to accommodate the connecting rod20, and since this opening must of necessity be somewhat larger than the said rod to allow for oscillation of the latter, it frequently happens in actual practice that some ofthe lubricant which is contained in the hollow plunger splashes out through the said opening and on to the exterior surface of the s'aid'top wall. In order to conserve this lubricant and feed it to the working surfaces of the plunger and cylinder, the said top wall is inclined slightly downwardly in all directions from the opening 46, or, in other words, is

the upper portion of the cylinder, as indicated at 47, thus providing a space greater than the normal clearance between the V plunger and'cylinde'r, into which'the said a as lubricant may flow during the upper portion of the stroke of the plunger, and from which it may flow downwardly on the cylinder walls, when the plunger is below the said enlargement.

The top wall of the plunger is provided with an opening 48, through which lubricant may ;be introduced into the interior, which sages 42 and 43 tothe contacting surfaces 1 of the plunger and cylinder walls- Thelubricant within the plunger also lubricates, the bearing surfaces of the connecting rod 20 and piston pin 35. Any lubricant which splashes through the opening 46, due to ,reciprocation of the plunger or the vibration of the apparatus, willbe vfed to the space formed by the offset 47 andto-the cylinder walls, as above described.

The valves 23 and 26, as well as their housings 22 and 25, are preferably identical,'to reduce .the cost of manufacture. I

While one form of the invention has been illustrated and described, it. is obvious that those skilled in the art may varyithe details of construction, as well as-the, precise arrangements of parts, without departing from the spirit of the invention, and there- .fore it is .notcwished to ,be limited tofthe' pin bearings provided with passagesaadapted to conduct lubricant to the bores thereof;

a hollow follower telescoping over said piston member to provide afsubstantially closed hollow plunger adapted to, containlubricant, saidfollowerhaving lubricant passages affording. communication between the bores of said piston pin bearings and the exterior of the plunger; and means for securingthe follower to thepiston member,

2. A self-lubricating plunger-forpumps and the like, comprising a, hollow piston member having f a working headand a. skirt of reduced diameter, said skirt .beingprovided with piston pin bearings having passages adapted to'conduct lubricant t0 the bores thereof ,an inverted hollow follower contain lubricant, said follower havingv lubricant passages affording communication between said piston pin bores and the exterior of the plunger; yieldable packing interposed between the follower wall and the head of said piston member; and means for adjustably securing said follower'to said piston member.

3. A self-lubricating plunger for pumps and the like, comprising a hollow piston member having a. working head and a skirt of reduced diameter, said skirt being provided with piston pin bearings having passages adapted to conduct lubricant to the bores thereof; an inverted hollow follower having a conical top wall provided with a central opening to accommodate a connect-.

ing rod, telescoping over said skirt to provide a substantially closed hollow plunger adapted to contain lubricant, said follower also having lubricant passages afl'ording communication between said piston pin bores and the exterior of the plunger; yieldable packing interposed between the follower wall and the head of said piston member;

and means for adjustably securing said follower to said piston member.

In testimony whereof I affix my signature.

CHARLES I. LON GENECKER. 

